Evaluating The Effect Of High Rap Content On Asphalt Mixtures And Binders Fatigue Behavior

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Evaluating The Effect Of High Rap Content On Asphalt Mixtures And Binders Fatigue Behavior

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Author : Umme Amina Mannan
language : en
Publisher:
Release Date : 2018

Evaluating The Effect Of High Rap Content On Asphalt Mixtures And Binders Fatigue Behavior written by Umme Amina Mannan and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 2018 with Asphalt categories.

One of the main concerns with the application of reclaimed asphalt pavement (RAP) in the asphalt concrete pavement is fatigue cracking due to the stiffness increase with the addition of aged and stiff RAP binder. The purpose of this study is to evaluate fatigue performance of asphalt binder and mixtures with different RAP percentages (0, 15, 25, 35 and 40 %). Among these, 35 and 40 % RAP mixes are considered as high RAP content. This study describes the results of laboratory fatigue response of asphalt mixtures and extracted binders containing RAP to define the effect of RAP on the fatigue performance. To achieve this objective, mixes and binders were tested using the beam fatigue test and the time-sweep test, respectively. Test results were analyzed using two different fatigue approaches, reduction in stiffness and dissipated energy criteria. Results showed that a higher initial stiffness and initial dissipated energy initiate the fatigue failure faster. Since both binders and mixes show an increase in the stiffness and energy consumed per loading cycle with the addition of RAP, resulting mixes containing higher RAP have a very short fatigue life. Also, the fatigue endurance limit decreases drastically with the addition of RAP in the mix. The results comparing two different RAP sources showed that the RAP source has more prominent effect on the mix fatigue performance than the binder fatigue performance. Finally, the traditional fatigue life prediction model is modified to incorporate the effect of RAP in the fatigue equation. The modified regression model predicted reasonable fatigue life of the mixture with a coefficient of determination (R2) close to 1. The measured and predicted fatigue life results were found close to each other for both mix and binder containing RAP.

Fatigue And Stiffness Evaluations Of Reclaimed Asphalt Pavement In Hot Mix Asphalt Mixtures

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Author : Feipeng Xiao
language : en
Publisher:
Release Date : 2011

Fatigue And Stiffness Evaluations Of Reclaimed Asphalt Pavement In Hot Mix Asphalt Mixtures written by Feipeng Xiao and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 2011 with Asphalt categories.

The recycling of existing asphalt pavement materials produces new pavements with considerable savings in material, money, and energy. Understanding the ability of an asphalt pavement containing reclaimed asphalt pavement (RAP) to resist fracture from repeated loads is essential for the design of hot mix asphalt (HMA) mixtures. However, reaching a better understanding of fatigue behaviors of these pavements continues to challenge researchers all over the world, particularly, as recycled materials with more complex properties are being used in HMA pavements. This study explores the utilization of the conventional fatigue analysis approach in investigating the fatigue life of asphalt mixtures containing RAP. The fatigue beams were made with two asphalt binders, two aggregate sources, four RAP contents (0 %, 15 %, 25 %, and 30 %), and tested at 5 and 20°C. A total of eight mixtures was evaluated and 64 fatigue beams were tested in this study. The test results indicated that the addition of RAP, as expected, increased the viscosity, G*sin?, and creep stiffness values while reducing the m-values. However, no obvious trends were found for stiffness and fatigue life of mixtures as the RAP content increased. Statistical analysis results indicated that for binders and mixtures containing 30 % RAP, the utilization of softer binder significantly decreased the viscosity, G*sin?, and creep stiffness values; however, there were no significant differences in the stiffness and fatigue life values of these mixtures.

Improved Mix Design Evaluation And Materials Management Practices For Hot Mix Asphalt With High Reclaimed Asphalt Pavement Content

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Author : Randy Clark West
language : en
Publisher: Transportation Research Board
Release Date : 2013

Improved Mix Design Evaluation And Materials Management Practices For Hot Mix Asphalt With High Reclaimed Asphalt Pavement Content written by Randy Clark West and has been published by Transportation Research Board this book supported file pdf, txt, epub, kindle and other format this book has been release on 2013 with Pavements, Asphalt categories.

TRB's National Cooperative Highway Research Program (NCHRP) Report 752: Improved Mix Design, Evaluation, and Materials Management Practices for Hot Mix Asphalt with High Reclaimed Asphalt Pavement Content describes proposed revisions to the American Association of State Highway and Transportation Officials (AASHTO) R 35, Superpave Volumetric Design for Hot Mix Asphalt, and AASHTO M 323, Superpave Volumetric Mix Design, to accommodate the design of asphalt mixtures with high reclaimed asphalt pavement contents.

Development Of An Asphalt Damage Characterization System Using Laser Scanning Detection Technology

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Author : Hossein Ajideh
language : en
Publisher:
Release Date : 2011

Development Of An Asphalt Damage Characterization System Using Laser Scanning Detection Technology written by Hossein Ajideh and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 2011 with categories.

Fatigue damage is a major distress in asphalt pavement and has been evaluated using various experimental and analytical approaches over the last two decades. However, a better understanding of fatigue behavior is needed for improved design and repair methods to minimize failures. The first objective of the present research was to develop a new non-contact damage characterization technique to monitor fatigue behavior of asphalt mixes using laser scanning detection system. The second objective of the study was to evaluate the capability of the new technique for measuring the effect of engineered binders modified by a special reaction technique on critical fatigue damage resistance properties. The third and final objective was to investigate mixtures produced with high percentage of Reclaimed Asphalt Pavement (RAP) for damage resistance and compared to the mixes produced with un-modified and modified binders. The laser scanning technique is a non-contact measuring system that detects changes in surface properties using a parameter called "defect frequency" by scanning a laser beam along the specimen surface. The results of the present laser scanning method were compared to the data obtained from other traditional measuring systems using conventional deflection measuring devices. Analysis of data included the defect frequency and the change in mechanical properties in terms of reduction in initial stiffness, as well as dissipated energy approaches (Ratio of dissipated energy and Energy Ratio). Fatigue resistance and material response of several mixes were investigated in the present work under various cyclic uniaxial tensile loading conditions by monitoring the intensity of scattered light from the specimen surface. The laser scanning results indicate that this technique is capable of effectively capturing crack initiation and propagation processes. Defect frequency data exhibit excellent agreement with changes in mechanical capacity and dissipated energy properties as damage develops. The number of cycles to failure indicated by laser scanning correlated well with that obtained from traditional and dissipated energy methods. An analysis of the results also reveals superior performance of the modified binders in terms of fatigue resistance, when compared to the base binder. The mixtures produced with the engineered binders and with high RAP content offer better resistance to damage for a wide range of simulated pavement strain amplitudes.

Laboratory Evaluation Of Asphalt Concrete Mixtures Containing High Contents Of Reclaimed Asphalt Pavement Rap And Binder

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Author :
language : en
Publisher:
Release Date : 2014

Laboratory Evaluation Of Asphalt Concrete Mixtures Containing High Contents Of Reclaimed Asphalt Pavement Rap And Binder written by and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 2014 with Asphalt categories.

This study investigated the effect of added asphalt binder content on the performance and volumetric properties of asphalt concrete mixtures containing reclaimed asphalt pavement (RAP) in the amounts of 0%, 20%, and 40%. A laboratory-produced mixture containing 100% RAP was also evaluated. Performance of the mixtures was evaluated based on three criteria: stiffness (dynamic modulus), fatigue resistance, and rutting resistance (flow number and asphalt pavement analyzer). Results showed that a 0.5% increase in binder content improved both the fatigue and rutting resistance of the 0% and 20% RAP mixtures with only slight (insignificant) decreases in dynamic modulus. However, the addition of various amounts of binder to the 40% RAP mixture led to a significant decrease in rutting resistance with little or no improvement to fatigue resistance. Volumetric analysis was performed on all of the mixtures, and detailed results are presented. Based on the results of the study, the authors recommend that the Virginia Department of Transportation supplement current asphalt mixture design procedures that are based on mixture volumetric properties with laboratory-mixture performance testing.

Hot Mix Asphalt Mixtures

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Author :
language : en
Publisher:
Release Date : 1999

Hot Mix Asphalt Mixtures written by and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 1999 with categories.

Fatigue Of Asphalt Binders

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Author : Wilfung Martono
language : en
Publisher:
Release Date : 2008

Fatigue Of Asphalt Binders written by Wilfung Martono and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 2008 with categories.

Introduction To Unmanned Aircraft Systems Second Edition

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Author : Douglas M. Marshall
language : en
Publisher: CRC Press
Release Date : 2015-10-26

Introduction To Unmanned Aircraft Systems Second Edition written by Douglas M. Marshall and has been published by CRC Press this book supported file pdf, txt, epub, kindle and other format this book has been release on 2015-10-26 with Political Science categories.

The proliferation of technological capability, miniaturization, and demand for aerial intelligence is pushing unmanned aerial systems (UAS) into the realm of a multi-billion dollar industry. This book surveys the UAS landscape from history to future applications. It discusses commercial applications, integration into the national airspace system (NAS), System function, operational procedures, safety concerns, and a host of other relevant topics. The book is dynamic and well-illustrated with separate sections for terminology and web- based resources for further information.

Evaluating The Performance Of The Asphalt Mixes Containing Reclaimed Asphalt Pavement By Considering The Effect Of Silo Storage Time

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Author : Hawraa Kadhim
language : en
Publisher:
Release Date : 2020

Evaluating The Performance Of The Asphalt Mixes Containing Reclaimed Asphalt Pavement By Considering The Effect Of Silo Storage Time written by Hawraa Kadhim and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 2020 with Asphalt pavements categories.

The use of reclaimed asphalt pavement (RAP) in hot mix asphalt (HMA) has been increasing in the last few decades because of its cost benefits and because of a compelling need to preserve the environment and natural resources. It is commonly assumed that HMA containing RAP (HMA-RAP) has an improved resistance to permanent deformation (rutting) and decreased resistance to the fatigue cracking. This is due to the fact that asphalt binder contained in the RAP has been oxidized over the years and is typically stiffer than virgin asphalt binder. However, during the production stage of the HMA-RAP, the blending between aged and virgin asphalt binders would be incomplete or partial, which would lead to heterogeneous distribution of the aged and virgin asphalt binders within the asphalt mix with RAP. Therefore, the purpose of this article is to evaluate the effect of silo storage on the blending mechanism between virgin and RAP asphalt binders and the impact that this would have on performance of the mix. Two plant-produced asphalt mixes (HL-3 and HL-8), typically used in the province of Ontario for surface and base courses in flexible pavements, were considered in this study. The mixes were designed with 15 and 30 % RAP, respectively, and the samples were collected immediately after the production (0 h) or at different silo storage times (1, 4, 8, and 12 h). The temperatures of the collected materials were closely monitored and recorded. The findings of this research indicated that silo-stored samples exhibited some improvement in their rutting and fatigue resistance. The examination of the dynamic modulus master curves indicated that the rheology of the mixes evolved with silo storage and that blending between the aged and the virgin binders has been improved.

Pavement And Asset Management

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Author : Maurizio Crispino
language : en
Publisher: CRC Press
Release Date : 2019-02-21

Pavement And Asset Management written by Maurizio Crispino and has been published by CRC Press this book supported file pdf, txt, epub, kindle and other format this book has been release on 2019-02-21 with Technology & Engineering categories.

Pavement and Asset Management contains contributions from the World Conference on Pavement and Asset Management (WCPAM 2017, Baveno, Italy, 12-16 June 2017). For the first time, the European Pavement and Asset Management Conference (EPAM) and the International Conference on Managing Pavement Assets (ICMPA) were joining forces for a global event that aimed not only at academics and researchers, but also at practitioners, engineers and technicians dealing with everyday tasks and responsibilities related to transport infrastructures pavement and asset management. Pavement and Asset Management covers a wide range of topics, from emerging research to engineering practice, and is grouped under the following themes: - Data quality and monitoring - Economics, political and environmental management, strategies - Deterioration models - Key performance indicators - PMS-case studies - Design and materials - M&R treatments - LCA & LCCA - Risk and safety - Bridge and tunnel management - Smart infrastructure and IT Pavement and Asset Management will be valuable to academics and professionals interested and/or involved in issues related to transport infrastructures pavement and asset management.